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Commitments and Contingencies (Contractual Obligations) (Details) $ in Millions | Dec. 31, 2018 CAD ($)
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Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | $ 2,111 |
Contractual Obligation, Due in Second Year | 1,207 |
Contractual Obligation, Due in Third Year | 610 |
Contractual Obligation, Due in Fourth Year | 480 |
Contractual Obligation, Due in Fifth Year | 425 |
Contractual Obligation, Due after Fifth Year | 4,015 |
Contractual Obligation | 8,848 |
Nova Scotia Power Inc. [Member] | Maritime Link Project [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Second Year | 111 |
Purchased Power [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 204 | [1]
Contractual Obligation, Due in Second Year | 203 | [1]
Contractual Obligation, Due in Third Year | 209 | [1]
Contractual Obligation, Due in Fourth Year | 208 | [1]
Contractual Obligation, Due in Fifth Year | 209 | [1]
Contractual Obligation, Due after Fifth Year | 2,194 | [1]
Contractual Obligation | 3,227 | [1]
Fuel And Gas Supply [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 642 |
Contractual Obligation, Due in Second Year | 237 |
Contractual Obligation, Due in Third Year | 49 |
Contractual Obligation, Due in Fourth Year | 7 |
Contractual Obligation, Due in Fifth Year | 3 |
Contractual Obligation, Due after Fifth Year | 0 |
Contractual Obligation | 938 |
Demand Side Management [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 44 |
Contractual Obligation, Due in Second Year | 1 |
Contractual Obligation, Due in Third Year | 0 |
Contractual Obligation, Due in Fourth Year | 0 |
Contractual Obligation, Due in Fifth Year | 0 |
Contractual Obligation, Due after Fifth Year | 0 |
Contractual Obligation | 45 |
Transportation [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 569 | [2],[3]
Contractual Obligation, Due in Second Year | 347 | [2],[3]
Contractual Obligation, Due in Third Year | 255 | [2],[3]
Contractual Obligation, Due in Fourth Year | 215 | [2],[3]
Contractual Obligation, Due in Fifth Year | 170 | [2],[3]
Contractual Obligation, Due after Fifth Year | 1,492 | [2],[3]
Contractual Obligation | 3,048 | [2],[3]
Transportation [Member] | NEGG [Member] | Independent Transmission and Distribution System [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 5 |
Contractual Obligation, Due in Second Year | 5 |
Contractual Obligation, Due in Third Year | 5 |
Contractual Obligation, Due in Fourth Year | 4 |
Contractual Obligation, Due in Fifth Year | 4 |
Contractual Obligation, Due after Fifth Year | 59 |
Contractual Obligation | 82 |
Long-term service agreements [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 110 | [4],[5]
Contractual Obligation, Due in Second Year | 67 | [4],[5]
Contractual Obligation, Due in Third Year | 42 | [4],[5]
Contractual Obligation, Due in Fourth Year | 30 | [4],[5]
Contractual Obligation, Due in Fifth Year | 33 | [4],[5]
Contractual Obligation, Due after Fifth Year | 246 | [4],[5]
Contractual Obligation | 528 | [4],[5]
Long-term service agreements [Member] | NEGG [Member] | Independent Transmission and Distribution System [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 46 |
Contractual Obligation, Due in Second Year | 9 |
Contractual Obligation, Due in Third Year | 24 |
Contractual Obligation, Due in Fourth Year | 16 |
Contractual Obligation, Due in Fifth Year | 16 |
Contractual Obligation, Due after Fifth Year | 137 |
Contractual Obligation | 248 |
Capital projects [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 524 | [6]
Contractual Obligation, Due in Second Year | 147 | [6]
Contractual Obligation, Due in Third Year | 45 | [6]
Contractual Obligation, Due in Fourth Year | 11 | [6]
Contractual Obligation, Due in Fifth Year | 3 | [6]
Contractual Obligation, Due after Fifth Year | 8 | [6]
Contractual Obligation | 738 | [6]
Capital projects [Member] | Tampa Electric Division [Member] | Independent Transmission and Distribution System [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 439 |
Equity investment commitments [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 0 | [7]
Contractual Obligation, Due in Second Year | 190 | [7]
Contractual Obligation, Due in Third Year | 0 | [7]
Contractual Obligation, Due in Fourth Year | 0 | [7]
Contractual Obligation, Due in Fifth Year | 0 | [7]
Contractual Obligation, Due after Fifth Year | 0 | [7]
Contractual Obligation | 190 | [7]
Leases and other [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 18 | [8]
Contractual Obligation, Due in Second Year | 15 | [8]
Contractual Obligation, Due in Third Year | 10 | [8]
Contractual Obligation, Due in Fourth Year | 9 | [8]
Contractual Obligation, Due in Fifth Year | 7 | [8]
Contractual Obligation, Due after Fifth Year | 75 | [8]
Contractual Obligation | $ 134 | [8]
[1] | Annual requirement to purchase electricity production from independent power producers or other utilities over varying contract lengths.
[2] | Includes $82 million related to NEGG transportation capacity ($5 million in 2019; $5 million in 2020; $5 million in 2021; $4 million in 2022; $4 million in 2023 and $59 million thereafter). On completion of the sale of the NEGG facilities, the remaining future contractual obligations will be transferred to the buyer. Refer to note ##NHFS for additional information.
[3] | Purchasing commitments for transportation of fuel and transportation capacity on various pipelines.
[4] | Includes $248 million related to various long-term service agreements NEGG has entered into for maintenance of certain generating equipment ($46 million in 2019; $9 million in 2020; $24 million in 2021; $16 million in 2022; $16 million in 2023 and $137 million thereafter). On completion of the sale of the NEGG facilities, the remaining future contractual obligations will be transferred to the buyer. Refer to note ##NHFS for additional information.
[5] | Maintenance of certain generating equipment, services related to a generation facility and wind operating agreements, outsourced management of computer and communication infrastructure and vegetation management.
[6] | Includes $439 million of commitments related to Tampa Electric's solar and Big Bend Power Station modernization projects.
[7] | Emera has a commitment to make equity contributions to the Labrador Island Link Limited Partnership.
[8] | Operating lease agreements for office space, land, plant fixtures and equipment, telecommunications services, rail cars and vehicles.

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X
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